value

# File lib/rake/promise.rb, line 28
    def value
      unless complete?
        stat :sleeping_on, :item_id => object_id
        @mutex.synchronize do
          stat :has_lock_on, :item_id => object_id
          chore
          stat :releasing_lock_on, :item_id => object_id
        end
      end
      error? ? raise(@error) : @result
    end